functions.php

<?php

/**
 * Add 'post' post type to CMS Page Order
 * @author Bill Erickson
 * @link http://www.billerickson.net/code/change-post-types-cms-page-order
 *
 * @param array $post_types
 * @param array $post_types modified
 */
function be_sort_post( $post_types ) {
	$post_types[] = 'post';
	return $post_types;
}
add_filter( 'cmspo_post_types', 'be_sort_post' );